EDP Sciences
Free access
Volume 434, Number 2, May I 2005
Page(s) 671 - 676
Section Stellar structure and evolution
DOI http://dx.doi.org/10.1051/0004-6361:20042302

A&A 434, 671-676 (2005)
DOI: 10.1051/0004-6361:20042302

HD 34700 is a T Tauri multiple system

M. F. Sterzik1, C. H. F. Melo1, A. A. Tokovinin2 and N. van der Bliek2

1  European Southern Observatory, Casilla 19001, Santiago 19, Chile
    e-mail: msterzik@eso.org
2  Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile

(Received 2 November 2004 / Accepted 28 December 2004)

We have imaged the young double-lined spectroscopic binary HD 34700 in the near-infrared and find evidence for two faint, visual, stellar components at 5$\farcs$2 and 9$\farcs$2 distance. High-resolution echelle spectroscopy of both stars shows strong Li I 6708 Å absorption and H$\alpha$ emission. The spectral types of the companions are estimated from the spectra and photometry as M1-M2 and M2-M3. Their radial velocities are similar to the center-of-mass velocity of the central SB2; hence all four stars are most probably physically bound and constitute a young quadruple stellar system with an inner short-period binary. We provide a list of pre-main sequence spectroscopic binaries with additional components of which HD 34700 is yet another example. The available statistics strengthen the suspicion that dynamical effects in multiple systems play a key role in the formation of very close binaries early in their evolution.

Key words: binaries: spectroscopic -- stars: formation -- binaries: close -- binaries: general -- stars: pre-main sequence

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© ESO 2005